Pipe wrench



M. L. TERRY.

PIPE WRENCH.

` AFPLCAUON FILED FEB-14| i922- 1,4'37,&73 Patented Dec. 5, 1922.

kdm@ @@N Patented Dec. 5, 1922.

UNITED STATES PATENT OFFICE.

MELZAR L. TERRY, F INDIAN ORCHARD, MASSACHUSETTS.

PIPE WRENCH.

Application filed February 14, 1922. Serial No. 536,495.

i which the following is a specication.

This invention relates to improvements in wrenches and particularly tothe type known as pipe wrenches or sometimes they are lmown in the tradeas the Stillson wrench. l An object of the invention is to provide apipe wrench in which the yoke member is formed with safety guardportions and openings therein which I term safety openings or guarddevices to prevent the movable Jaw member of the wrench from' beingmoved outward too far thus avoiding the possible breakage of the yoke.

A further object is to provide means for changing or substituting j awplates of dif-t ferent shapes so that the wrench may be quickly changedand used with flat jaws or faces as a monkey' wrench, or with curvedplates as a pipe wrench to prevent crushing the pipe when it is grippedby the wrench.

. A further obj ect is to provide springbearing plates on the handlemember with which the yoke member engages in order to keep the wrench inproper working position.

A further object is to provide the outer end of the handle member with acurved part for forming a pinch bar.

Referring to the drawings:

Fig.,1 is a side elevational view' showing the parts of thewrenchassembled and with the triple yoke member attached to the han-VV dlemember. In this viewthe gripping jaw plates are shown curved for ittinga pipe also the handle member is shown with' a curved end to forma pinchbar.

Figs. 2 and 3 are enlarged views of the inner and outer members'of themovable jaw and of the outer end -of the handle member,

respectively showing the set screws for-- maintaining the jaw plates inposition.

Fig. 1 is a flat-or smooth faced jaw plate.

Fig. 5 is one lwith serrations or teethV formed thereon.

Figs. `6 and 7 are side and elevationaly views, respectively of a curvedjaw plate. y

Fig. 8 is a modification of the yoke member showing a single guard onthe yoke.

Fig. ,9 is a further modication ofthe yoke showing a double guard as apart of 6. These threads are engaged by the in-` teriorly threadedadjusting ring or nut 7. 8 designates a yoke that is pivotally connectedto the bar 1 by means of the pin or bolt 9, whereby the jaw 5 and itssupporting yoke may be moved about this point as a center. 7 designatesan opening in which the nut 7 is located. The yoke 8 is formed with asafety guard piece 10 which is spaced from the body part of the yoke ,bythe opening 11. A second safety guard member is indicated at 12 which isspaced from the depending portion 13 of the yoke as indicated atv14 and15 is an additional safety guard member which surrounds the forwardlower end of the handle 1. The opening 11 is for ywhich is moved outwardby means of a set `screw 19 which screw is formed with a` conical shapedend 2O which engages the inclined surface 21 of the pin 18, whereby whenthe set screw 19 is rotated pin 18 is moved outward against the jawplate thus clamping it in the dove-tailed shaped groove. The pin 18 isformed with arib 18to prevent its rotating, with relation to the setscrew .19 or turning out of its position. 22 designates a' removableplate in the movable jaw 5 which is heldin place by means of the setscrew 23. 24 (see Fig. 4) designates a Jaw plate that is made flat orsmooth on its gripping face and which may be substitute for the rplates16 or 22 when the wrench 1s to be used as a monkey wrench.

For the purpose of maintaining the yoke 8 p in working position on thehandle, springs 26 are placed on the upper and lower edges respectivelyof the handle 1. These springs are held in place by means of wedges orother suitable devices, indicated at 20.

Fig. 8 shows a yoke shaped member in which a single safety guard deviceis used and the dependingpart. 15 and the upper extending part 10 of theyoke 8 shown in Fi 1 is omitted. A

gig. 9 shows a yoke the same as Fig. 8 but with the safety guard 10 aswell as the guards 12 and 13 but with the ,portion 15 omitted. Thesesafety guard pieces are for the purpose of preventing the member 8 frombeing displaced should the pin or bolt 9 break. The curved portion 3serves as a pinch bar and is in effect a combination tool, combining thewrench and pinch bar construction. By employing the saftey guardmembers, the strain and stresses are equally distributed by the yokemember. Should the part 15 of the yoke 8 break it is clear that theother portions of the yoke would permit it to be used. 1n other wordsthe `safety guard members 10, 12, 13 and 15 serve to permit theseportions of the yoke to receive the initial strain when a break occurs,thus serving to prevent a complete breakage of the whole yoke piece.

``What I claim is:

1. In a wrench, the combination of a handle member having a dove-tailedgroove at the forward end to receive a jaw plate, means for moving theplate outward comprising a slidable pin formed with an inclined end, aset screw engaging said end for moving the plate outward, as described.

2. In a wrench, the combination, of a handle member, an adjustable jaw'member separate from the handle member, means for connecting the jaw tothe handle, the adjustable jaw member having a dove tailed oove, aremovable plate in the groove of the adjustable jaw member, a set screweX- tending from the outer end of said adjustable member for 'forcingthe plate against the sides of the groove for holding the plate inposition,'said handle member having a removable plate on its outer endwhich cooperates with the removable plate in the jaw member.

3. In a wrench of the type described, the combination, of a handlemember, a yoke pivotally connected thereto for receiving a movable jaw,springs formed with bent end portions and located on the upper and loweredges of the handle member to provide bearing surfaces for the yokemember for retainying it in operative position` for the purposedescribed, the handle member having openings in which the bent portionsof the springs are located.

4. 1n a pipe wrench, the combination, of a handle member, having a fixedjaw member thereon, said jaw having a grooved recess for receiving aninterchangeable plate, a pin extendin inward from the plate of the fixedjaw mem er for engaging the plate for moving the same outward, the pinhaving an inclined end portion, said pin having a rib thereon forretaining it in position, and a set screw engaging its inclinedinner endfor moving the pin against the plate for locking the same in position inthe recess.

MELZ L. TERRY.

